The owner attribution helper used to fall back from display_name to
the part of the email before "@" when no display name was set. That
defeats the point of letting users pick a name: anyone who hadn't
explicitly chosen one had their email prefix surfaced publicly.
New fallback chain, applied uniformly:
- display_name (the user's chosen name) — if set, use it
- username (also chosen by the user as a URL slug) — if set, use it
- null — render nothing; the client hides the attribution line
Wire type ActivityPublic.owner_display is now `string | null`.
ActivityRow renders the "Lagt til av X" line only when display is
non-null.
Same idea applied to the user's own surfaces (nav + greeting):
- Nav button shows "Profil" (a label, not a name) when display_name
is empty, instead of falling back to the email.
- Home greeting drops "Velkommen, <name>." entirely when the user
has no display name, leaving just "Her er aktivitetene dine ...".
The feedback list (moderator view) and admin user table keep showing
the email — moderators and admins legitimately need it to identify
users for triage and role management.
Ole-Morten Duesund
43c24ec16b